Arthroscopic view from the posteromenial portal. A probe is inserted via the trans-septal portal from the posterolateral portal (A). Proliferative synovial tissue (arrow heads) arising from the posterior horn of the medial meniscus (MM) expands to the septum. Resection of synovial tissue, cyst and posterior septum was completed (B). Posterior cruciate ligament (PCL) and lateral femoral condyle (LC) can be seen. MC: medial femoral condyle.